Marked IPC::ChannelProxy as non thread-safe. Added DCHECKs to verify that all public IPC::ChannelPr…

ipc/ipc_channel_proxy.h

Index: ipc/ipc_channel_proxy.h
diff --git a/ipc/ipc_channel_proxy.h b/ipc/ipc_channel_proxy.h
index 9755e13d7fb88a1208315be2f7f37273e46f5b93..e4cd83a4dd736390b510a85052c7375e0a56791c 100644
--- a/ipc/ipc_channel_proxy.h
+++ b/ipc/ipc_channel_proxy.h
@@ -10,6 +10,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
+#include "base/threading/non_thread_safe.h"
 #include "ipc/ipc_channel.h"
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_listener.h"
@@ -51,7 +52,7 @@ class SendCallbackHelper;
 // The consumer of IPC::ChannelProxy is responsible for allocating the Thread
 // instance where the IPC::Channel will be created and operated.
 //
-class IPC_EXPORT ChannelProxy : public Sender {
+class IPC_EXPORT ChannelProxy : public Sender, public base::NonThreadSafe {
  public:
   struct MessageFilterTraits;